Rainer Mueller knows the real dangers of food poisoning because years ago, it happened to his son.

Watch the story Friday on "20/20" at 10 p.m. ET

"He ate a hamburger, got sick, and within 10 days was dead. Thirteen years old, never a chance to do anything," he said. "He was captain of the soccer team, a quality straight-A student. He was a great kid."

A grieving Mueller joined a group called Safe Tables Our Priority (STOP), which lobbies to mandate cleaner food, but then he discovered that totally clean food is often a myth.

The One Proven Way to Make Food Cleaner

"It's impossible to get food completely clean, especially if the bacteria are inside the food," he said. "You can scrub the outside all you want, and you'll get it clean, but you won't get it safe."

There is one proven way to make food safer: irradiate it.

Irradiation is the process of moving food through a stream of ionized energy. It's a little like an X-ray machine, except the point is to kill bacteria.

Studies show that irradiation works. Irradiated meat stays fresh twice as long, and irradiated strawberries can last up to three weeks on the shelf.

Astronauts have been eating irradiated food for years, because NASA doesn't want to worry about them getting food poisoning.

Omaha Steaks, a gourmet mail-order meat company, irradiates all its hamburger meat and is confident in the safety of its irradiated products. In fact, ground meat that's not irradiated should come with a danger warning label, says the company's president Bruce Simon, because no matter how carefully anyone disinfects a production plant, they can never kill all the harmful bacteria.

"Our plants are cleaner than any emergency room I've ever been in," said Simon. "But it only takes four cells to make a person sick. At least with irradiation I know I can kill those cells."

Food Irradiation: Safe or Unsafe?

With so much food-borne illness, why doesn't America irradiate more food?

Because radiation scares people.

"You hear irradiation and you think nuclear energy and you think of meltdowns," said nutritionist Ruth Kava of the American Council on Science and Health. "Chernobyl, Three Mile Island -- all those, and yet it's nothing like that."

They were successful at getting noticed and at getting other people to worry.

Wenonah Hauter, president of the protest group Food and Water Watch and author of "Zapped: Irradiation and the Death of Food," claims that irradiated food causes "cancer, premature death, and lower body weight."

"Well, there's a large body of evidence that shows that lab animals experience these problems," Hauter said.

The author of another study cited by Hunter said the Food and Water Watch claims "are a collection of half-truths, misunderstandings and misinterpretation."

"The author of the study works for a facility that gets government money to basically promote irradiation," Hauter shot back.

So does the author of the study not understand what his own study shows, or are activists like Hauter manipulating studies to scare people about something that would save lives?

"What my organization does is inform people so that they can make their own decisions about the food they eat," Hauter said.

Unnecessary Deaths?

Irradiation opponents also claim that irradiation destroys the quality of the food.

"You can't really irradiate a fruit or vegetable enough to kill the bacteria unless you want it to turn to mush," Hauter claimed. "It's been described as smelling like singed hair or tasting like wet dog."

Irradiation companies say that's nothing but lies, and to prove it they provided some samples of irradiated food for "20/20."

We offered samples of irradiated papaya to random people on the street to compare to regular papaya, and many even preferred the irradiated papaya. In fact, many said it tasted fresher and sweeter.

It may taste fresh and it might prevent millions of cases of food poisoning, but groups like Food and Water Watch have been so effective that today only a fraction of 1 percent of all beef and poultry is irradiated in the United States.

"We should be getting rid of the unnecessary causes of death that are easy to take care of," said nutritionist Kava. "And food irradiation could help do that."